Introduction Frequency-selective fading is a dominant impairment in mobile communications Fading reduces receive signal-to-noise ratio and degrades the bit-error-rate(BER) Frequency selectivity of the channel, i. e, delay spread, induces inter-symbol interference(ISI) To combat frequency-selective fading

IEEE TRANSACTIONS ON COMMUNICATIONS. VOL 50. NO. 1 JANUARY 2002 LDPC-Based Space-Time Coded OFDM Systems Over Correlated Fading Channels: Performance Analysis and Receiver design Ben Lu, Student Member, IEEE, Xiaodong Wang, Member, IEEE, and Krishna R Narayanan, Member: IEEE AbstrackWe consider a space-time coded (STC) orthogonal systems integrate the techniques of antenna array spatial diver-

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Improving performance of coherent coded It can be shown that if the channel estimates are perfect(a1=a1, a2 OFDM systems using space time transmit a2)diversity can be achieved

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《OFDM技术开发系列》（英文版） Beyond 3G Wideband wireless data access based on OFDM and dynamic packet assignment

一、填空题(每小题1分,共15分) 1、数据通信系统是通过数据电路将分布在远地的数据终端设备与计算机系统连接起来,实现数据传 输 存储和处理的系统

第一节波形信源的统计特性和离散化 第二节连续信源和信源的信息测度 第三节具有最大熵的连续信源 第四节连续信道和波形信道的分类 笫五节连续信道和波形信道的信息传输率 笫六节连续信道和波形信道的信道容量 第七节连续信道编码定理

循环码 1、循环码的多项式描述 2、循环码的生成多项式 3、系统循环码 4、多项式运算电路 5、循环码的编码电路 6、循环码的译码 7、循环汉明码 8、缩短循环码

差错率:差错率是衡量传输质量的重要指 标之一,它有以下几种不同的定义。 码元差错率:指在传输的码元总数中发生差错的码 元数所占的比例(平均值),简称误码率。 比特差错率/比特误码率:指在传输的比特总数中发 生差错的比特数所占的比例(平均值)。在二进制 传输系统中,码元差错率就是比特差错率。 码组差错率:指在传输的码组总数中发生差错的码 组数所占的比例(平均值)